package filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

//注册过滤器
@WebFilter(value = "/success.html")
public class LoginFilter001 implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        //创建的时候调用
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //调用子类  强转到需要的类型
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

//        Cookie[] cookies = request.getCookies();

        //ifn 等于null
        //inn 不等于null
//        if (cookies != null) {
//            for (Cookie cookie : cookies) {
//                if("hl".equals(cookie.getName())){
//
//                    filterChain.doFilter(request,response);
//                    return;
//
//                }
//            }
//        }
        HttpSession session = request.getSession();
        String user = (String) session.getAttribute("huali");

        if (user != null && !"".equals(user)){
            filterChain.doFilter(request,response);
            return;
        }

        //选择一种页面跳转方式
        //转发
        request.getRequestDispatcher("/index.html").forward(request,response);
        //重定向
//        response.sendRedirect("/index.html");

    }

    @Override
    public void destroy() {
        //销毁时调用
    }
}
